OnTriggerEnter2D Running twice when destroying game object.

I am trying to make a key and a door system with multiple players, where if one player gets a key the others are able to use it, the only problem I am running into is that the keys are getting collected twice by the same GameObject, and Destroy(other.gameObject) is not working. Here is my code (Please note: playerManager is what stores the number of keys):

    if (other.tag == "Key" && other.gameObject != null)
     {
         Destroy(other.gameObject);
         Destroy(other);
         playerManager.keys++;
     }

     if (other.tag == "Door" && other.gameObject != null)
     {
         if (playerManager.keys > 0)
         {
             Destroy(other.gameObject);
             Destroy(other);
             playerManager.keys--;
         }
     }

All help would be appreciated.